Merge WebKit at r64264 : Initial merge by git.

Change-Id: Ic42bef02efef8217a0f84c47176a9c617c28d1f1

1 files changed, 231 insertions, 0 deletions

diff --git a/JavaScriptCore/wtf/PageAllocation.cpp b/JavaScriptCore/wtf/PageAllocation.cpp
new file mode 100644
index 0000000..58a10f6
--- /dev/null
+++ b/JavaScriptCore/wtf/PageAllocation.cpp
@@ -0,0 +1,231 @@
+/*
+ * Copyright (C) 2008, 2009, 2010 Apple Inc. All rights reserved.
+ * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "PageAllocation.h"
+
+#if HAVE(ERRNO_H)
+#include <errno.h>
+#endif
+
+#if HAVE(MMAP)
+#include <sys/mman.h>
+#include <unistd.h>
+#endif
+
+#if OS(WINDOWS)
+#include "windows.h"
+#endif
+
+#if OS(SYMBIAN)
+#include <e32hal.h>
+#endif
+
+namespace WTF {
+
+#if HAVE(MMAP)
+
+bool PageAllocation::commit(void* start, size_t size, bool, bool) const
+{
+#if HAVE(MADV_FREE_REUSE)
+    while (madvise(start, size, MADV_FREE_REUSE) == -1 && errno == EAGAIN) { }
+#else
+    UNUSED_PARAM(start);
+    UNUSED_PARAM(size);
+#endif
+    return true;
+}
+
+void PageAllocation::decommit(void* start, size_t size) const
+{
+#if HAVE(MADV_FREE_REUSE)
+    while (madvise(start, size, MADV_FREE_REUSABLE) == -1 && errno == EAGAIN) { }
+#elif HAVE(MADV_FREE)
+    while (madvise(start, size, MADV_FREE) == -1 && errno == EAGAIN) { }
+#elif HAVE(MADV_DONTNEED)
+    while (madvise(start, size, MADV_DONTNEED) == -1 && errno == EAGAIN) { }
+#else
+    UNUSED_PARAM(start);
+    UNUSED_PARAM(size);
+#endif
+}
+
+PageAllocation PageAllocation::allocate(size_t size, Usage usage, bool writable, bool executable)
+{
+    return allocateAt(0, false, size, usage, writable, executable);
+}
+
+PageAllocation PageAllocation::reserve(size_t size, Usage usage, bool writable, bool executable)
+{
+    return reserveAt(0, false, size, usage, writable, executable);
+}
+
+PageAllocation PageAllocation::allocateAt(void* address, bool fixed, size_t size, Usage usage, bool writable, bool executable)
+{
+    int flags = MAP_PRIVATE | MAP_ANON;
+    if (fixed)
+        flags |= MAP_FIXED;
+
+    int protection = PROT_READ;
+    if (writable)
+        protection |= PROT_WRITE;
+    if (executable)
+        protection |= PROT_EXEC;
+
+    void* base = mmap(address, size, protection, flags, usage, 0);
+    if (base == MAP_FAILED)
+        base = 0;
+
+    return PageAllocation(base, size);
+}
+
+PageAllocation PageAllocation::reserveAt(void* address, bool fixed, size_t size, Usage usage, bool writable, bool executable)
+{
+    PageAllocation result = allocateAt(address, fixed, size, usage, writable, executable);
+    if (!!result)
+        result.decommit(result.base(), size);
+    return result;
+}
+
+void PageAllocation::deallocate()
+{
+    int result = munmap(m_base, m_size);
+    ASSERT_UNUSED(result, !result);
+    m_base = 0;
+}
+
+size_t PageAllocation::pagesize()
+{
+    static size_t size = 0;
+    if (!size)
+        size = getpagesize();
+    return size;
+}
+
+#elif HAVE(VIRTUALALLOC)
+
+static DWORD protection(bool writable, bool executable)
+{
+    if (executable)
+        return writable ?PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ;
+    return writable ?PAGE_READWRITE : PAGE_READONLY;
+}
+
+bool PageAllocation::commit(void* start, size_t size, bool writable, bool executable) const
+{
+    return VirtualAlloc(start, size, MEM_COMMIT, protection(writable, executable)) == start;
+}
+
+void PageAllocation::decommit(void* start, size_t size) const
+{
+    VirtualFree(start, size, MEM_DECOMMIT);
+}
+
+PageAllocation PageAllocation::allocate(size_t size, Usage, bool writable, bool executable)
+{
+    return PageAllocation(VirtualAlloc(0, size, MEM_COMMIT | MEM_RESERVE, protection(writable, executable)), size);
+}
+
+PageAllocation PageAllocation::reserve(size_t size, Usage usage, bool writable, bool executable)
+{
+    return PageAllocation(VirtualAlloc(0, size, MEM_RESERVE, protection(writable, executable)), size);
+}
+
+void PageAllocation::deallocate()
+{
+    VirtualFree(m_base, 0, MEM_RELEASE); 
+    m_base = 0;
+}
+
+size_t PageAllocation::pagesize()
+{
+    static size_t size = 0;
+    if (!size) {
+        SYSTEM_INFO system_info;
+        GetSystemInfo(&system_info);
+        size = system_info.dwPageSize;
+    }
+    return size;
+}
+
+#elif OS(SYMBIAN)
+
+bool PageAllocation::commit(void* start, size_t size, bool writable, bool executable) const
+{
+    if (m_chunk) {
+        intptr_t offset = static_cast<intptr_t>(base()) - static_cast<intptr_t>(start);
+        m_chunk->Commit(offset, size);
+    }
+    return true;
+}
+
+void PageAllocation::decommit(void* start, size_t size) const
+{
+    if (m_chunk) {
+        intptr_t offset = static_cast<intptr_t>(base()) - static_cast<intptr_t>(start);
+        m_chunk->Decommit(offset, size);
+    }
+}
+
+PageAllocation PageAllocation::allocate(size_t size, Usage usage, bool writable, bool executable)
+{
+    if (!executable)
+        return PageAllocation(fastMalloc(size), size, 0);
+    RChunk* rchunk = new RChunk();
+    TInt errorCode = rchunk->CreateLocalCode(size, size);
+    return PageAllocation(rchunk->Base(), size, rchunk);
+}
+
+PageAllocation PageAllocation::reserve(size_t size, Usage usage, bool writable, bool executable)
+{
+    if (!executable)
+        return PageAllocation(fastMalloc(size), size, 0);
+    RChunk* rchunk = new RChunk();
+    TInt errorCode = rchunk->CreateLocalCode(0, size);
+    return PageAllocation(rchunk, rchunk->Base(), size);
+}
+
+void PageAllocation::deallocate()
+{
+    if (m_chunk) {
+        m_chunk->Close();
+        delete m_chunk;
+    } else
+        fastFree(m_base);
+    m_base = 0;
+}
+
+size_t PageAllocation::pagesize()
+{
+    static TInt page_size = 0;
+    if (!page_size)
+        UserHal::PageSizeInBytes(page_size);
+    return page_size;
+}
+
+#endif
+
+}